28791750 has 64 divisors (see below), whose sum is σ = 77418432. Its totient is φ = 7084800.

The previous prime is 28791743. The next prime is 28791757. The reversal of 28791750 is 5719782.

It is an interprime number because it is at equal distance from previous prime (28791743) and next prime (28791757).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 28791699 and 28791708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8274 + ... + 11226.

It is an arithmetic number, because the mean of its divisors is an integer number (1209663).

Almost surely, 2^28791750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28791750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38709216).

28791750 is an abundant number, since it is smaller than the sum of its proper divisors (48626682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28791750 is a wasteful number, since it uses less digits than its factorization.

28791750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986 (or 2976 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 28791750 is about 5365.7944425779. The cubic root of 28791750 is about 306.4945013992.

The spelling of 28791750 in words is "twenty-eight million, seven hundred ninety-one thousand, seven hundred fifty".